One notices that Fig. 6(b) of Ref. [1]} lacks comparison between
\(S_{\rm th}^{\rm MBCS}\)  and \(S_{\rm th}^{\rm exact}\)  quantitiesWhat is plotted by thick solid line in this figure and makes
impression of agreement with \(S_{\rm th}^{\rm MBCS}\)  is not specified..
The latter quantity can be easily calculated
from \(E_{tot}^{\rm exact}\)  (thick solid line in Fig. 4(a) of
Ref. [1]}).
A level of expected disagreement between \(S_{\rm th}^{\rm MBCS}\)  and
\(S_{\rm th}^{\rm exact}\)  quantities can be seen from our
Fig. REF (a) (compare dashed curve with circles).
